Not sure - I'm not aware of any federation NIP? How would I advertise my relays? Use their onion addresses? How does your non-tor client (afaik all of the current clients) discover my content if it won't know what an onion address is?

To counter these kinds of shenanigans, the most privacy preserving setup I could get to for nostr is to just force route a js-enabled browser through the tor socks5h proxy, or use orbot on Android (not sure about iOS, orbot hasn't worked for me on there since a longer time.) Some relays won't work due to some cloudflare setting. Amethyst works well with orbot though.

This improves nothing versus the current situation - you can do the same (and I've been doing this for years) for GitHub. What I'm trying to find out is if there is demand for a solution that is privacy preserving by default. Nostr isn't that right now.

In settings you can give your pubkey and a relay list and the NIP-05 file will then be published by SN. Very nice feature actually - good for onboarding too!